for the last couple of days , i have felt really depressed at night , even though there's nothing for me to be depressed about . i feel sad & empty & worthless . it's weird bc during the day , im happy and feel confident. but at night , i just feel stuck & feel like nothing is really worth it . i haven't had any sucidal thoughts . i don't feel like killing myself . but i just feel sad . i have been stressed and somewhat sad lately over a "break up" but im already over It , so idk why i would feel super depressed at night . like when it's nighttime , i try to cheer myself up & be happy , but it just feels pointless . help ?